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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da050544b8b5f73bab41548c390609d80ac4f6219cccec84d5b55af11b65d528' 
  AND token = 'WMZu8zk+ASYDn1wcJZjK1H0A0gvMAZiqBh6FCrvAsMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}